Yes. However, I think it all reduces down to something simple; whatever you store may never by other physical cores be seen at all, and if it is seen, it may be seen in any order. I have one unanswered question here though, which is to do with stores to the same location. I wonder if these can be sure to be seen in order of stores, or not.Originally Posted by Codeplug
I may be wrong, but I think this is not so. Memory barriers do solve the ordering problem, but they do not solve the visibility problem; what you store *if it becomes visible* will become visible in the correct order (which is to say, order as constrained by store barriers) but there is no guarantee it *will become visible*. A forced write to memory (and only a force write to memory) guarantees that earlier stores will then be visible (as constrained by such store barriers issued up to that point).- the solution is memory barriers. Once you understand what the HW can do under the hood, you can forget about it - knowing that your membars will just "do the right thing".
However, we are now repeating ourselves =-) I think you undestand what I mean, and I understand what you mean, so that's that :-)
